linkedin post 2017-02-22 06:46:52

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LINGERING SHADOWS. "Remains of the notochord are retained as the gel-like nucleus pulposus at the center of intervertebral discs. It is difficult if not impossible to discern these transformations as remnants of solely evolutionary or developmental alteration—plainly, these changes are intertwined—but it is abundantly clear that the structures that remain are mere shadows of their former ontogenetic and phylogenetic states, and thus guides to organismal history." https://evolution-outreach.springeropen.com/articles/10.1186/s12052-014-0012-5 View in LinkedIn
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linkedin post 2017-02-24 05:14:19

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FINDING A NEW FUNCTION. "With exaptations (‘pre-adaptations’) the function changes over time, yielding other historical information. As with vestiges, an exaptation can be a structure but it can also be a behavior or process." https://evolution-outreach.springeropen.com/articles/10.1186/s12052-014-0012-5 View in LinkedIn
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linkedin post 2017-02-24 05:08:43

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ANACHRONISTIC ADAPTATIONS. "A good example is the large, hard-shelled, gourd-type fruit of the calabash (Crescentia) tree, which has been posited as an ‘anachronistic’ adaptation for seed dispersal by gomphotheres, large, elephant-like mammals that went extinct over 10,000 years ago." https://evolution-outreach.springeropen.com/articles/10.1186/s12052-014-0012-5 View in LinkedIn
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linkedin post 2017-02-24 05:01:46

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RETENTION ON BACKGROUND OF CHANGE. "To most minds evolution is a steady progression of change, but what ultimately marks vestiges and other ‘holdover’ phenomena is a distinct lack of change. George Williams pointed out that adaptationist stories “are not about evolution so much as about its absence” in the sense that adaptations represent static retention of features because stabilizing selection culls less optimal forms." https://evolution-outreach.springeropen.com/articles/10.1186/s12052-014-0012-5 View in LinkedIn
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linkedin post 2017-02-23 04:31:28

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INSIGHTS INTO THE PAST. "When seen from the perspective of closely related lineages (e.g., humans and apes) and their extinct common ancestors, these features tell us not only about extant taxa. They can also reveal important lessons about their history." https://evolution-outreach.springeropen.com/articles/10.1186/s12052-014-0012-5 View in LinkedIn
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